465 results about "Alloy composite" patented technology

The invention discloses a nickel-based alloy composite plate and a preparation method thereof, and belongs to the technical field of nickel-based alloys, the nickel-based alloy composite plate comprises a stainless steel bottom plate and a nickel-based alloy plate, and the nickel-based alloy plate comprises, by weight, 52-58 parts of nickel powder, 17-21 parts of molybdenum powder, 8-12 parts of copper powder, 7-9 parts of boron powder, 2-3 parts of modified hafnium carbide powder, 4-7 parts of an alloy reinforcing agent and 2-3 parts of a fluxing agent. The modified hafnium carbide prepared from hafnium oxide and nano carbon powder successfully replaces metal hafnium with high cost in the traditional process; and meanwhile, the actual adding proportion of the modified hafnium carbide in the nickel-based alloy plate is greatly reduced, the cost of industrial mass production is doubly reduced from the two aspects of raw material selection and dosage control, and the economic requirement of large-scale production is better met.

A hardened alloy composite material comprising an alloy matrix and reinforcing particles dispersed in the alloy matrix, the reinforcing particles having a shell and core structure, wherein the shell and the core have different chemical compositions, and wherein the reinforcing particles are formed by a MAX phase compound and / or a MAB phase compound.

The invention discloses a preparation method of ODS alloy composite powder for laser additive manufacturing. The invention belongs to the technical field of metal additive manufacturing materials, and particularly relates to a preparation method of oxide dispersion strengthening (ODS) alloy composite powder for laser additive manufacturing. The metal matrix powder is divided into two particle size intervals by taking 30 [mu] m as a particle size critical point, the metal matrix powder in the two particle size intervals is mixed with the nano oxide powder through differential acoustic resonance to form two kinds of composite powder, and the ODS alloy composite powder is obtained by mixing the two kinds of composite powder. According to the method, different high-energy acoustic resonance mixing time is adopted for coating characteristic differences caused by different masses of metal powder (smaller than or equal to 30 microns and gt; 30 microns) in different particle size intervals. And finally, the thicknesses of nano oxide coating layers of all the powder are accurately controlled to be 500 nm or below, and the risks of nano oxide agglomeration and large-size slag formation in the SLM process are remarkably reduced.

The invention provides a friction-resistant high-entropy alloy composite coating and a preparation method thereof, and belongs to the technical field of metal surface modification. A FeCoCrNiMox (x is greater than or equal to 0.18 and less than or equal to 0.25) high-entropy alloy is taken as a main component of composite powder, graphene is taken as an additive phase, and the FeCoCrNiMox high-entropy alloy composite coating is prepared on the surface of a matrix by adopting a laser cladding method. The graphene added in the composite powder can generate carbides in situ under the action of laser cladding, and second phase strengthening, solid solution strengthening and fine grain strengthening are generated, so that the friction resistance of the surface of the matrix is remarkably improved. The preparation method is easy to operate and low in cost, the prepared composite coating is high in bonding strength, good in toughness and plasticity and excellent in friction resistance, the surface performance of equipment can be effectively improved, safe and stable operation of the equipment is guaranteed, the service life of the equipment is prolonged, and maintenance expenditure is reduced.

The invention relates to the technical field of nuclear fusion surface plasma W materials, in particular to nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder, a composite material and a preparation method of the nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder. The composite powder is of a nearly spherical core-shell hierarchical structure, and the particle size is 30-50 nm; according to the composite powder, refractory metal W serves as a matrix, nano rare earth oxide ceramic particles are evenly dispersed in matrix W crystal grains, Ti mainly forms an enrichment area on the surface of the matrix or a matrix / rare earth oxide interface in a simple substance or oxide mode, the phase interface structure is effectively improved, W crystal boundary migration and dislocation motion are hindered, W crystal grains are remarkably refined, and the composite powder is prepared. Part and W form semi-coherence, fine grain and interface strengthening and toughening are achieved, and a brand new thought and a technical method are provided for synergistically improving the strength and toughness of the W composite material. The composite powder is subjected to organic reduction synthesis and low-temperature reinforced sintering to prepare the composite material, the tensile strength at the room temperature reaches 500-610 MPa, and the ductility is 5%-8%.

The present invention relates to a rare earth oxide dispersion-strengthened FeCoNiCrMn high-entropy alloy coating and a preparation method thereof. The FeCoNiCrMn high-entropy alloy powder comprises: a molar fraction of Fe of 18-22%, a molar fraction of Co of 18-22%, a molar fraction of Ni of 18-22%, a molar fraction of Cr of 18-22%, and a molar fraction of Mn of 18-22%. The FeCoNiCrMn high-entropy alloy powder and rare earth oxide particles are mixed in any reasonable mass ratio. The present invention primarily increases component supercooling by adding rare earth elements, thereby increasing the internal nucleation rate of the coating and achieving grain refinement under laser cladding technology, ultimately enhancing the mechanical properties of the high-entropy alloy composite coating, including hardness, wear resistance, and corrosion resistance. When the Sm2O3 mass content is 2%, the hardness of the composite coating is the highest, which is 15.85% higher than that of the high-entropy alloy coating; with the increase of Sm2O3 mass content, the wear resistance and corrosion resistance of the composite coating tend to first increase and then decrease. When the Sm2O3 mass content is 2%, its wear resistance and corrosion resistance reach the maximum.

The invention relates to the technical field of metal materials, in particular to a ceramic reinforced aluminum alloy composite material and a preparation method thereof. The aluminum alloy composite material comprises the following raw materials in parts by weight: 75-85 parts of an aluminum alloy matrix and 10-20 parts of a ceramic reinforced phase, a preparation method of the ceramic reinforced phase comprises the following steps: step 1, adding silicon carbide and a silane coupling agent into absolute ethyl alcohol, and drying after ultrasonic dispersion; 2, dissolving tetraethoxysilane in an ethanol-water mixed solvent, adjusting the pH value to 3-4, adding the silicon carbide treated in the step 1, stirring to form sol, drying, converting into gel, and calcining to form a coating layer; step 3, dispersing the silicon carbide treated in the step 2 into water, adding nickel nitrate, uniformly stirring, adding a reducing agent, stirring for reaction, and collecting precipitate particles; and 4, adding an interface modifier, and uniformly mixing. The ceramic reinforced aluminum alloy composite material has high strength, high wear resistance and good mechanical property and thermal stability.

The invention discloses a preparation method of high-toughness nickel-based alloy composite powder for additive manufacturing. The method comprises the steps that nickel-based alloy matrix powder and nanometer reinforced particles are fed into a forming cavity, under the inert atmosphere and cooling conditions, a spiral blade is driven to rotate at the high speed of 15000-30000 rpm, meanwhile, the pressure in the cavity is maintained to be 2-8 MPa, and treatment is conducted for 30-120 minutes; and through the synergistic effect of kinetic energy and high-speed airflow, combination of size selective milling and cold welding is achieved, and the core-shell structure composite powder with matrix powder evenly coated with nano-reinforced particles is prepared. According to the preparation method, ball-milling-medium-free design is adopted, powder pollution and sphericity deterioration are avoided, and the prepared composite powder has high sphericity and fluidity, is suitable for the laser additive manufacturing process and can effectively refine grains, inhibit element segregation, cooperatively improve the strength and toughness of components and solve the problem of high-plasticity inversion.

A deformation-driven additive manufacturing method for a low-interfacial-stress aluminum-steel composite structure comprises the steps that an aluminum alloy thin tube is filled with an adding phase with a low thermal expansion coefficient or a negative thermal expansion coefficient and aluminum-silicon powder used for enhancing the thermal plasticizing fluidity of a raw material wire according to the proportion, and after drying treatment, the raw material wire for adjusting the thermal expansion coefficient is manufactured; a continuous wire feeding friction stir additive manufacturing method is adopted, aluminum alloy raw material wires and adjusting raw material wires are synchronously fed according to the rate proportion changing layer by layer, deposition is driven through deformation, and an aluminum alloy composite transition layer with additive phase components changing in a gradient mode is formed; after the aluminum alloy composite material transition layer is completely prepared, the continuous wire feeding friction stir additive manufacturing method is continuously adopted, and continuous deposition is conducted on the aluminum alloy composite material transition layer to form an aluminum alloy deposition layer; and after deposition manufacturing of the component is completed, subtractive machining treatment is carried out, and a final product is obtained. The invention relates to the technical field of dissimilar material additive manufacturing.

The invention discloses a preparation method of a copper-zirconium alloy wear-resistant coating based on laser cladding, relates to the technical field of wear-resistant coatings, and is used for solving the technical problem that a high-performance wear-resistant coating cannot be prepared due to poor bonding quality and low cladding efficiency of a cladding layer and a copper-zirconium alloy matrix in the existing laser cladding process. The preparation method of the copper-zirconium alloy wear-resistant coating based on laser cladding comprises the following steps: obtaining a copper-zirconium alloy matrix; preparing a CuSn film layer on the surface of the copper-zirconium alloy matrix, wherein the thickness of the CuSn film layer is 0.5-2 microns; preparing an iron-based coating on the surface of the CuSn film layer, wherein the thickness of the iron-based coating is 0.8-1.0 mm; preparing a wear-resistant layer on the surface of the iron-based coating, wherein the thickness of the wear-resistant layer is 1-1.2 mm; the material for preparing the wear-resistant layer is nickel-based alloy composite ceramic powder, and the nickel-based alloy composite ceramic powder comprises nickel-based alloy and ceramic powder.

The invention relates to the technical field of heat exchange, and particularly discloses a gallium-based alloy composite working medium and a preparation method thereof.The gallium-based alloy composite working medium comprises a main heat transfer fluid and nano particles dispersed in the main heat transfer fluid, and the main heat transfer fluid is liquid gallium-based alloy; the nano particle comprises a metal core, a non-metal shell layer coated outside the metal core and a carbon nano material layer coated outside the non-metal shell layer. The carbon nanomaterial is modified on the surface of the non-metal shell layer, the dispersion condition of nanoparticles in liquid metal is effectively improved, and meanwhile, the carbon nanomaterial can effectively mask silicon hydroxyl on the surface of the non-metal shell layer and prevent self-polymerization tendency between the non-metal shell layers by modifying the surface of the non-metal shell layer.

The embodiment of the invention discloses an injection-molded long carbon fiber reinforced polyether-ether-ketone alloy composite material and a preparation method thereof. Nano filler modified polyether-ether-ketone alloy powder is prepared from polyether-ether-ketone, modified resin and a nano modifier; preparing soft and hard sizing agent hybrid modified long carbon fibers from continuous carbon fibers and the prepared sizing solution; nano-filler modified polyether-ether-ketone alloy powder, a deionized water solution containing a surfactant and a thickening agent and soft and hard sizing agent mixed modified long carbon fibers are adopted to prepare long carbon fiber master batches; and carrying out injection molding on the long carbon fiber master batch by adopting an optimized injection molding process to prepare the long carbon fiber reinforced polyether-ether-ketone alloy composite material. The mechanical properties, electric conduction, heat conduction and friction properties of the composite material are greatly improved, and the defects of a polymer material in the aspect of functionality are further made up; moreover, the effective retention length of fibers in the injection molding master batch is greatly increased, the organic solvent is prevented from damaging molecular chain segments of a resin matrix, and the injection molding master batch is more environment-friendly.

The invention provides a pulse-direct current electrochemistry composite deposition process of a nickel-tungsten-phosphorus alloy coating, and belongs to the technical field of coating preparation, and the pulse-direct current electrochemistry composite deposition process comprises the following steps: carrying out silane coupling agent modification treatment on alpha-aluminum oxide; carrying out modification treatment on the hexagonal boron nitride nanosheet by adopting hexadecyl trimethyl ammonium bromide; carrying out polyacrylic acid modification treatment on the nano silicon dioxide; nickel salt, tungsten salt, phosphorus salt, a complexing agent, a buffering agent, a primary brightener, a secondary brightener, a wetting agent, modified aluminum oxide, modified boron nitride, modified silicon dioxide and deionized water are mixed, stirred and heated, and a composite plating solution is obtained; the substrate serves as a cathode, pulse current is applied to the substrate for pulse electroplating, then the current density of the pulse current is continuously and linearly reduced to a target value, and finally direct current electroplating is conducted under the target value; by optimizing the formula of the composite plating solution and the pulse-direct current composite electroplating process, the nickel-tungsten-phosphorus alloy composite plating layer with high hardness, low friction, high wear resistance and corrosion resistance is finally obtained.

The invention discloses a graphene / aluminum alloy composite material with high conductivity and a preparation method thereof, and belongs to the technical field of metal-based composite materials. And the electric conductivity is not lower than 70% IACS. The preparation method comprises the following steps: carrying out surface copper plating pretreatment on aluminum alloy powder; performing ultrasonic dispersion on graphene by using a polyvinyl alcohol solution to obtain a stable dispersion liquid; mixing, stirring, drying and filtering the copper-plated powder and the graphene dispersion liquid to obtain graphene-coated composite powder; and finally, carrying out rapid densification sintering by adopting a spark plasma sintering technology. The core innovation point of the preparation method is that the problem of dispersion and interface combination of graphene in an aluminum matrix is solved synergistically through combination of a copper plating transition layer and PVA auxiliary dispersion-adsorption coating, then interface reaction is avoided through SPS rapid sintering, finally, the composite material with excellent conductivity is obtained, and the technical index reaches the domestic leading level.

The invention belongs to the technical field of surface engineering, and relates to a preparation method of a protective coating for a metal connector of a solid oxide battery. A compact transition metal oxide inner layer is deposited on a metal substrate in a reactive sputtering mode, then a transition metal alloy outer layer is deposited in a metal sputtering mode, a transition metal oxide / transition metal alloy composite coating is formed, and a spinel protective layer is formed after annealing treatment. According to the method, a transition metal oxide inner layer is used as a diffusion barrier layer, diffusion of elements such as Cr from a substrate to a coating and diffusion of oxygen to the substrate in the high-temperature annealing and long-term service process are effectively inhibited, and therefore the thickness of a reaction layer and the thickness of a thermal growth oxide layer are remarkably reduced. The composite coating is compact in structure, stable in component, good in matching with the thermal expansion coefficient of the substrate, excellent in oxidation resistance and low in surface specific resistance, and capable of effectively improving the long-term operation stability and prolonging the service life of the SOC connector.

The invention relates to the technical field of aluminum alloy composite materials, in particular to a preparation method of a SiC fiber reinforced aluminum matrix composite material. Carrying out hot isostatic pressing treatment on the sheath and the precursor wire, heating the sheath and the precursor wire to 400-500 DEG C at a heating rate of 4-7 DEG C / min, and keeping the temperature and the pressure under the pressure of 80-130 MPa; then cooling to 200 DEG C along with the furnace, maintaining the pressure of 80-130 MPa, and keeping the temperature and pressure; continuously cooling to 100 DEG C along with the furnace, adjusting the pressure to 100 MPa, and keeping the temperature and the pressure; and finally, cooling to room temperature along with the furnace to obtain the SiC fiber reinforced aluminum-based composite material. According to the preparation method, the problems that fibers are broken in advance, interface reaction products are uneven, failure is prone to occurring, and fiber arrangement is uneven in the existing SiC fiber reinforced aluminum matrix composite material preparation process are solved, and the SiC fiber reinforced aluminum matrix composite material with high tensile strength and high compressive strength at room temperature and high compressive strength at 200 DEG C is obtained.

The invention relates to the technical field of aluminum alloy composite materials, in particular to a preparation method of a SiC fiber reinforced aluminum matrix composite material with high compressive strength. A SiCf / 2024Al precursor wire is used as a core material, the SiCf / 2024Al precursor wire is loaded into a 2024Al alloy sheath, sheath packaging, hot isostatic pressing, multi-stage heat treatment and the like are carried out, the high-performance SiCf / 2024Al composite material is prepared, the SiC fiber reinforced aluminum-based composite material is composed of SiC fibers, a carbon layer, a 2024Al alloy matrix and the 2024Al alloy sheath in sequence, the obtained composite material matrix is uniform in grain size and morphology, and the size of the composite material is larger than that of the 2024Al alloy sheath. And large-size second phase segregation is avoided. According to the preparation method, the composite material is processed and formed by coating fibers on the matrix and adopting a hot isostatic technology, and then the matrix and the sheath are subjected to strong plasticity regulation and control through a multi-stage heat treatment system, so that the room-temperature compressive strength of the finally obtained SiCf / 2024Al composite material is 3,500 MPa or above.

The invention relates to the technical field of metal composite materials, and discloses a modified graphene reinforced aluminum alloy composite material and a preparation method thereof.The preparation method comprises the steps that zirconium hydroxide is loaded on graphene oxide through a hydrothermal reaction, then zirconium oxide modified graphene oxide is obtained through high-temperature sintering treatment, then reduction treatment is conducted in the hydrogen atmosphere, and the modified graphene reinforced aluminum alloy composite material is obtained. The preparation method comprises the following steps: preparing zirconium-modified graphene, then doping a boron element by adopting an ion implantation process to obtain composite modified graphene, doping zirconium, zirconium (Zr) and aluminum to form an Al3Zr compound, so that the recrystallization process can be hindered, recrystallized grains can be refined, and the generation of an aluminum carbide phase can be inhibited; by doping the boron element, the wettability between graphene and an aluminum alloy melt is improved, the uniform dispersity of graphene in an aluminum alloy matrix can be effectively improved, meanwhile, boron serves as a grain refiner and acts together with zirconium, the grain refinement effect can be further enhanced, and therefore the strength and plasticity of the aluminum alloy are improved.

The application discloses a preparation method of a high-wear-resistance railway turnout coating and relates to the technical field of railway turnout coatings. A surface grafted modified nano tungsten carbide reinforcing phase is formed; a nano composite pre-alloy powder is obtained; a spherical high-entropy alloy composite spraying powder with high fluidity is obtained; a rough anchoring surface with a micron-level staggered grid structure is constructed on the surface of a base material; a base coating substrate with a thermal expansion gradient buffer feature is obtained; an initial cladding coating workpiece is obtained; and the high-wear-resistance railway turnout coating is prepared. The application excludes closed pores in the powder, and significantly improves the density and fluidity of the powder.

The invention discloses a gradient strengthening preparation method of a cast high-entropy alloy composite material based on a laser cladding preform, and belongs to the technical field of metal matrix composite material preparation. The method comprises the following steps: firstly, preparing composite powder of a high-entropy alloy and a nano ceramic reinforced phase by combining plasma-assisted ball milling with a pulse electromagnetic field; then constructing a prefabricated body with a gradient pore structure by adopting an intelligent regulation and control laser cladding technology; the prefabricated body and a congruent-component high-entropy alloy cast ingot are innovatively metallurgically bonded through a vacuum gradient infiltration process, and a large-size overall composite material is prepared; and finally, forming a gradient nanostructure on the surface layer of the material through ultrasonic-assisted laser surface reconstruction and small-deformation gradient heat treatment. According to the method, the technical problems that reinforcing phases are uneven in distribution, the interface bonding strength is low, and large-size components are difficult to prepare are successfully solved, the prepared composite material has the excellent gradient performance that the surface hardness is larger than or equal to 12 GPa, and the core hardness is larger than or equal to 8 GPa, ceramic particles are evenly distributed in a three-dimensional network shape, the 800-DEG C high-temperature oxidation resistance is improved by 30% or above compared with a traditional high-entropy alloy, and the composite material is suitable for large-size components. The method is particularly suitable for manufacturing high-performance key components in the fields of aerospace, national defense and military industry and the like.

The invention discloses a preparation method of a high-entropy alloy composite coating capable of resisting frictional wear in a wide temperature range and the high-entropy alloy composite coating, and the method comprises the following steps: adding SiC and MoS2 ceramic particles into FeCoCrNi high-entropy alloy powder to form mixed powder; the mixed powder is subjected to ball milling treatment, and the mixed powder obtained after ball milling treatment is dried; the surface of the 316L stainless steel substrate is polished, decontaminated and cleaned; and the surface of the treated 316L stainless steel substrate is coated with the treated mixed powder through a laser cladding technology, so that the high-entropy alloy composite coating is formed on the surface of the 316L stainless steel substrate. Thus, based on the synergistic effect of SiC and MoS2 reinforced phases, the high-entropy alloy composite coating has excellent wear resistance and high-temperature stability, especially the antifriction and wear resistance in medium and high temperature areas, and in the preparation process, the high-entropy alloy composite coating is well metallurgically bonded with a 316L stainless steel substrate, so that the wear resistance of the coating is improved. The method has the advantages of compact structure, good cladding quality, uniform structure, high hardness, good wear resistance, no crack and the like.

The application provides a method for preparing a high-entropy alloy composite material. In the application, a high-entropy alloy grid is prepared by using a synchronous laser cladding technology, the high-entropy alloy grid is strengthened by using a heat treatment technology, the high-entropy alloy composite powder is formed by using a hot pressing technology, and finally the hot-pressed composite material is finally formed by using a laser melting technology. The existence of the high-entropy alloy grid can avoid the large-area enrichment of ceramic particles, the preform is prepared by using the hot pressing technology, the combination between the high-entropy alloy grid and the high-entropy alloy composite material in the subsequent melting process is increased, and the aggregation speed of the ceramic particles in the melting process is slowed down, so that the high-entropy alloy composite material is solidified and formed before the ceramic particles are aggregated. Therefore, the high-entropy alloy composite material prepared by the application does not have the aggregation of the reinforcing phase, and the composite material has good strength and toughness.

The application discloses a functionalized gold-silver nanowire alloy composite photoelectric material and a preparation method and application thereof. A pillar[6]arene molecule AuAg@WP6 capable of undergoing host-guest complexation with a serotonin molecule 5- HT is wrapped on the surface of gold-silver nanowire alloy AuAg NWs, and the AuAg@WP6 / rGO-C3N4 is loaded on a reduced graphene oxide and carbon nitride rGO-C3N4 composite material to design a PEC biosensing system. The AuAg@WP6 / rGO-C3N4 serves as a sensing material. The LSPR effect of the AuAg NWs under visible light irradiation promotes charge separation. The host-guest complexation of the WP6 can selectively adsorb a large amount of 5- HT to the surface of the material. Since the g-C3N4 and the rGO have similar pi-conjugated structures, the two are easy to be bonded to form the rGO-C3N4 composite material. The photo-induced holes on the rGO-C3N4 can accelerate the oxidation of the serotonin molecule, and further improve the photocurrent response to detect 5- HT. Based on the excellent photoelectrochemical performance of the composite material, the linear range for detecting 5- HT is 0.01-100 muM, and the detection limit is 2 nM (S / N=3).

The medium-thickness plate aluminum alloy composite welding system comprises a stirring head and a double-wire welding gun, the stirring head is arranged on a special machine and is driven by the special machine to move in the welding direction, and the double-wire welding gun is arranged at the tail end of a robot in the using state and is driven by the robot to move in the welding direction during welding. The stirring head is arranged in the front and used for conducting friction stir welding on the splicing position of the two medium-thickness aluminum alloy plates, and the double-wire welding gun is arranged in the rear and used for conducting covering welding on indentations left by welding of the stirring head on the two medium-thickness aluminum alloy plates. The friction stir welding process is firstly adopted, the problems of fusion welding air holes and fast heat conduction of materials are solved, the welding efficiency is high, beveling before welding is not needed, welding materials and protective gas are saved, then double-wire arc welding is adopted for fast cosmetic welding, the problem that friction stir welding seams are slightly lower than base metal is solved, the cosmetic welding seams are thin, most bubbles can directly overflow, and the welding efficiency is high. And air holes are avoided.

The invention relates to a preparation method of a fiber cloth reinforced polyphenylene sulfide alloy prepreg sheet material, a composite board as well as a preparation method and application of the composite board. The preparation method of the prepreg sheet material comprises the following steps: crushing polyphenylene sulfide, and screening to obtain PPS powder; mixing the PPS powder with a second component colloid and an auxiliary agent to obtain a blended rubber material; enabling the reinforced fiber cloth to pass through a hot coating machine head of multi-layer hot melting coating equipment through a traction system, conveying the blended rubber material to the hot coating machine head, and coating two surfaces of the reinforced fiber cloth with the blended rubber material; and then compacting is carried out, and the prepreg sheet material is formed. And carrying out hot lamination on the laminated prepreg sheets to form the fiber cloth reinforced polyphenylene sulfide alloy composite board. Through the synergistic effect of the hot coating process and the high-temperature-resistant adhesive resin, the key technical problems of non-uniform fiber impregnation caused by high viscosity of a PPS melt, pore defects caused by solvent residues, low interface bonding strength, difficulty in balancing toughening and heat resistance and the like are solved, and the high-performance composite board which is high in compactness and mechanical property and can be recycled and reprocessed is obtained.

The present invention belongs to the technical field of metal composite plate preparation and relates to a high-bonding-strength bimetallic layered composite material and its preparation process, comprising the following steps: material preparation: cutting titanium alloy and cemented carbide as raw materials, cutting iron foil and vanadium foil as intermediate layer materials, and surface treating the raw materials and intermediate layer materials respectively; stacking the surface-treated raw materials and intermediate layer materials in the order of cemented carbide / iron foil / vanadium foil / titanium alloy to form a composite blank to be composited; placing the composite blank in a hot pressing furnace for hot pressing and diffusion composite bonding. After the hot pressing and diffusion composite bonding is completed, the blank is cooled to room temperature in the furnace and removed to prepare the bimetallic layered composite material. The use of the Fe / V composite intermediate layer material in the present invention can reduce interfacial residual stress and effectively avoid the formation of malignant brittle interlayer compounds. The resulting titanium alloy / hard alloy composite plate has high interfacial bonding strength, with an interfacial shear strength of at least 120 MPa.

This invention discloses a neodymium iron boron (NdFeB) magnet and its preparation method, belonging to the field of NdFeB technology. The NdFeB magnet comprises a NdFeB alloy and a dopant, wherein the dopant includes WC-Pr-based alloy composite micropowder. The NdFeB alloy is melted, spun into powder, hydrogen-cured, and milled using air jet milling to obtain alloy powder. The alloy powder is then mixed with the dopant and oriented and pressed in a magnetic field. The resulting blank undergoes isostatic pressing, vacuum sintering, and tempering heat treatment to obtain the NdFeB magnet. The WC-Pr-based alloy composite micropowder prepared by ball milling combined with low-temperature diffusion annealing forms a composite structure of a hard WC core and a ductile Pr-based alloy shell. This structure can both utilize the grain boundary pinning and dispersion strengthening effect of WC particles to inhibit abnormal growth of the main phase grains and optimize the distribution and composition of the grain boundary phase with the help of the Pr-based alloy, enhancing grain boundary continuity and ductility. This significantly improves the remanence, coercivity, and maximum energy product of the magnet.

The invention discloses a high-performance Al-Mn alloy composite material and a preparation method thereof, and belongs to the technical field of metal material preparation. The material is of a surface layer-core part-surface layer continuous gradient structure, and the surface layer is prepared from 3.5% of Mn, 0.5%-1.0% of Cu, 0.8%-1.0% of Mg, 0.3%-0.8% of Zn, 0.2%-0.3% of Sc, 0.1%-0.2% of Cr, 0.4%-0.6% of TiO2 reinforcement and the balance Al and impurities; and the core part comprises the following components: 0.1 to 0.2 percent of Zr, 0.05 to 0.1 percent of Si, 0.4 to 0.6 percent of Al2O3 reinforcement and the balance of Al and impurities. The preparation method comprises the steps of mechanical powder mixing, gradient cold press molding, hot isostatic pressing densification, homogenization treatment, hot extrusion, annealing treatment and solid solution-two-stage aging treatment. Through gradient component design and a multi-process synergistic process, the strength, toughness and corrosion resistance of the material are synergistically improved, and the material is particularly suitable for power battery shells and other high-performance light-weight structural parts.

The present invention discloses a ceramic / high-entropy alloy composite particle-reinforced aluminum-based composite material and a laser additive manufacturing method thereof. Ceramic / high-entropy alloy composite powder and aluminum alloy powder are first mixed by ball milling to obtain a ceramic / high-entropy alloy composite particle-reinforced aluminum alloy composite powder. The three-component composite powder is then spread on a powder bed. Laser scanning is then used to melt and solidify the powder, adjusting the laser power, scanning speed, and scanning spacing, to form a ceramic / high-entropy alloy composite particle-reinforced aluminum-based composite material. The composite material of the present invention is highly dense, so the ceramic / high-entropy alloy composite particles can effectively improve the mechanical properties of the aluminum-based composite material and can be used in the manufacture of high-performance, complex parts for aerospace, automotive, and rail transportation applications.